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1/*
2 * Copyright 2019 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: AMD
23 *
24 */
25
26#include <linux/slab.h>
27
28#include "dm_services.h"
29#include "dm_helpers.h"
30#include "include/hdcp_msg_types.h"
31#include "include/signal_types.h"
32#include "core_types.h"
33#include "link.h"
34#include "link_hwss.h"
35#include "link/protocols/link_dpcd.h"
36
37#define DC_LOGGER \
38 link->ctx->logger
39#define HDCP14_KSV_SIZE 5
40#define HDCP14_MAX_KSV_FIFO_SIZE 127*HDCP14_KSV_SIZE
41
42static const bool hdcp_cmd_is_read[HDCP_MESSAGE_ID_MAX] = {
43 [HDCP_MESSAGE_ID_READ_BKSV] = true,
44 [HDCP_MESSAGE_ID_READ_RI_R0] = true,
45 [HDCP_MESSAGE_ID_READ_PJ] = true,
46 [HDCP_MESSAGE_ID_WRITE_AKSV] = false,
47 [HDCP_MESSAGE_ID_WRITE_AINFO] = false,
48 [HDCP_MESSAGE_ID_WRITE_AN] = false,
49 [HDCP_MESSAGE_ID_READ_VH_X] = true,
50 [HDCP_MESSAGE_ID_READ_VH_0] = true,
51 [HDCP_MESSAGE_ID_READ_VH_1] = true,
52 [HDCP_MESSAGE_ID_READ_VH_2] = true,
53 [HDCP_MESSAGE_ID_READ_VH_3] = true,
54 [HDCP_MESSAGE_ID_READ_VH_4] = true,
55 [HDCP_MESSAGE_ID_READ_BCAPS] = true,
56 [HDCP_MESSAGE_ID_READ_BSTATUS] = true,
57 [HDCP_MESSAGE_ID_READ_KSV_FIFO] = true,
58 [HDCP_MESSAGE_ID_READ_BINFO] = true,
59 [HDCP_MESSAGE_ID_HDCP2VERSION] = true,
60 [HDCP_MESSAGE_ID_RX_CAPS] = true,
61 [HDCP_MESSAGE_ID_WRITE_AKE_INIT] = false,
62 [HDCP_MESSAGE_ID_READ_AKE_SEND_CERT] = true,
63 [HDCP_MESSAGE_ID_WRITE_AKE_NO_STORED_KM] = false,
64 [HDCP_MESSAGE_ID_WRITE_AKE_STORED_KM] = false,
65 [HDCP_MESSAGE_ID_READ_AKE_SEND_H_PRIME] = true,
66 [HDCP_MESSAGE_ID_READ_AKE_SEND_PAIRING_INFO] = true,
67 [HDCP_MESSAGE_ID_WRITE_LC_INIT] = false,
68 [HDCP_MESSAGE_ID_READ_LC_SEND_L_PRIME] = true,
69 [HDCP_MESSAGE_ID_WRITE_SKE_SEND_EKS] = false,
70 [HDCP_MESSAGE_ID_READ_REPEATER_AUTH_SEND_RECEIVERID_LIST] = true,
71 [HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_SEND_ACK] = false,
72 [HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_STREAM_MANAGE] = false,
73 [HDCP_MESSAGE_ID_READ_REPEATER_AUTH_STREAM_READY] = true,
74 [HDCP_MESSAGE_ID_READ_RXSTATUS] = true,
75 [HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE] = false
76};
77
78static const uint8_t hdcp_i2c_offsets[HDCP_MESSAGE_ID_MAX] = {
79 [HDCP_MESSAGE_ID_READ_BKSV] = 0x0,
80 [HDCP_MESSAGE_ID_READ_RI_R0] = 0x8,
81 [HDCP_MESSAGE_ID_READ_PJ] = 0xA,
82 [HDCP_MESSAGE_ID_WRITE_AKSV] = 0x10,
83 [HDCP_MESSAGE_ID_WRITE_AINFO] = 0x15,
84 [HDCP_MESSAGE_ID_WRITE_AN] = 0x18,
85 [HDCP_MESSAGE_ID_READ_VH_X] = 0x20,
86 [HDCP_MESSAGE_ID_READ_VH_0] = 0x20,
87 [HDCP_MESSAGE_ID_READ_VH_1] = 0x24,
88 [HDCP_MESSAGE_ID_READ_VH_2] = 0x28,
89 [HDCP_MESSAGE_ID_READ_VH_3] = 0x2C,
90 [HDCP_MESSAGE_ID_READ_VH_4] = 0x30,
91 [HDCP_MESSAGE_ID_READ_BCAPS] = 0x40,
92 [HDCP_MESSAGE_ID_READ_BSTATUS] = 0x41,
93 [HDCP_MESSAGE_ID_READ_KSV_FIFO] = 0x43,
94 [HDCP_MESSAGE_ID_READ_BINFO] = 0xFF,
95 [HDCP_MESSAGE_ID_HDCP2VERSION] = 0x50,
96 [HDCP_MESSAGE_ID_WRITE_AKE_INIT] = 0x60,
97 [HDCP_MESSAGE_ID_READ_AKE_SEND_CERT] = 0x80,
98 [HDCP_MESSAGE_ID_WRITE_AKE_NO_STORED_KM] = 0x60,
99 [HDCP_MESSAGE_ID_WRITE_AKE_STORED_KM] = 0x60,
100 [HDCP_MESSAGE_ID_READ_AKE_SEND_H_PRIME] = 0x80,
101 [HDCP_MESSAGE_ID_READ_AKE_SEND_PAIRING_INFO] = 0x80,
102 [HDCP_MESSAGE_ID_WRITE_LC_INIT] = 0x60,
103 [HDCP_MESSAGE_ID_READ_LC_SEND_L_PRIME] = 0x80,
104 [HDCP_MESSAGE_ID_WRITE_SKE_SEND_EKS] = 0x60,
105 [HDCP_MESSAGE_ID_READ_REPEATER_AUTH_SEND_RECEIVERID_LIST] = 0x80,
106 [HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_SEND_ACK] = 0x60,
107 [HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_STREAM_MANAGE] = 0x60,
108 [HDCP_MESSAGE_ID_READ_REPEATER_AUTH_STREAM_READY] = 0x80,
109 [HDCP_MESSAGE_ID_READ_RXSTATUS] = 0x70,
110 [HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE] = 0x0,
111};
112
113struct protection_properties {
114 bool supported;
115 bool (*process_transaction)(
116 struct dc_link *link,
117 struct hdcp_protection_message *message_info);
118};
119
120static const struct protection_properties non_supported_protection = {
121 .supported = false
122};
123
124static bool hdmi_14_process_transaction(
125 struct dc_link *link,
126 struct hdcp_protection_message *message_info)
127{
128 uint8_t *buff = NULL;
129 bool result;
130 const uint8_t hdcp_i2c_addr_link_primary = 0x3a; /* 0x74 >> 1*/
131 const uint8_t hdcp_i2c_addr_link_secondary = 0x3b; /* 0x76 >> 1*/
132 struct i2c_command i2c_command;
133 uint8_t offset = hdcp_i2c_offsets[message_info->msg_id];
134 struct i2c_payload i2c_payloads[] = {
135 { true, 0, 1, &offset },
136 /* actual hdcp payload, will be filled later, zeroed for now*/
137 { 0 }
138 };
139
140 switch (message_info->link) {
141 case HDCP_LINK_SECONDARY:
142 i2c_payloads[0].address = hdcp_i2c_addr_link_secondary;
143 i2c_payloads[1].address = hdcp_i2c_addr_link_secondary;
144 break;
145 case HDCP_LINK_PRIMARY:
146 default:
147 i2c_payloads[0].address = hdcp_i2c_addr_link_primary;
148 i2c_payloads[1].address = hdcp_i2c_addr_link_primary;
149 break;
150 }
151
152 if (hdcp_cmd_is_read[message_info->msg_id]) {
153 i2c_payloads[1].write = false;
154 i2c_command.number_of_payloads = ARRAY_SIZE(i2c_payloads);
155 i2c_payloads[1].length = message_info->length;
156 i2c_payloads[1].data = message_info->data;
157 } else {
158 i2c_command.number_of_payloads = 1;
159 buff = kzalloc(message_info->length + 1, GFP_KERNEL);
160
161 if (!buff)
162 return false;
163
164 buff[0] = offset;
165 memmove(&buff[1], message_info->data, message_info->length);
166 i2c_payloads[0].length = message_info->length + 1;
167 i2c_payloads[0].data = buff;
168 }
169
170 i2c_command.payloads = i2c_payloads;
171 i2c_command.engine = I2C_COMMAND_ENGINE_HW;//only HW
172 i2c_command.speed = link->ddc->ctx->dc->caps.i2c_speed_in_khz;
173
174 result = dm_helpers_submit_i2c(
175 link->ctx,
176 link,
177 &i2c_command);
178 kfree(buff);
179
180 return result;
181}
182
183static const struct protection_properties hdmi_14_protection = {
184 .supported = true,
185 .process_transaction = hdmi_14_process_transaction
186};
187
188static const uint32_t hdcp_dpcd_addrs[HDCP_MESSAGE_ID_MAX] = {
189 [HDCP_MESSAGE_ID_READ_BKSV] = 0x68000,
190 [HDCP_MESSAGE_ID_READ_RI_R0] = 0x68005,
191 [HDCP_MESSAGE_ID_READ_PJ] = 0xFFFFFFFF,
192 [HDCP_MESSAGE_ID_WRITE_AKSV] = 0x68007,
193 [HDCP_MESSAGE_ID_WRITE_AINFO] = 0x6803B,
194 [HDCP_MESSAGE_ID_WRITE_AN] = 0x6800c,
195 [HDCP_MESSAGE_ID_READ_VH_X] = 0x68014,
196 [HDCP_MESSAGE_ID_READ_VH_0] = 0x68014,
197 [HDCP_MESSAGE_ID_READ_VH_1] = 0x68018,
198 [HDCP_MESSAGE_ID_READ_VH_2] = 0x6801c,
199 [HDCP_MESSAGE_ID_READ_VH_3] = 0x68020,
200 [HDCP_MESSAGE_ID_READ_VH_4] = 0x68024,
201 [HDCP_MESSAGE_ID_READ_BCAPS] = 0x68028,
202 [HDCP_MESSAGE_ID_READ_BSTATUS] = 0x68029,
203 [HDCP_MESSAGE_ID_READ_KSV_FIFO] = 0x6802c,
204 [HDCP_MESSAGE_ID_READ_BINFO] = 0x6802a,
205 [HDCP_MESSAGE_ID_RX_CAPS] = 0x6921d,
206 [HDCP_MESSAGE_ID_WRITE_AKE_INIT] = 0x69000,
207 [HDCP_MESSAGE_ID_READ_AKE_SEND_CERT] = 0x6900b,
208 [HDCP_MESSAGE_ID_WRITE_AKE_NO_STORED_KM] = 0x69220,
209 [HDCP_MESSAGE_ID_WRITE_AKE_STORED_KM] = 0x692a0,
210 [HDCP_MESSAGE_ID_READ_AKE_SEND_H_PRIME] = 0x692c0,
211 [HDCP_MESSAGE_ID_READ_AKE_SEND_PAIRING_INFO] = 0x692e0,
212 [HDCP_MESSAGE_ID_WRITE_LC_INIT] = 0x692f0,
213 [HDCP_MESSAGE_ID_READ_LC_SEND_L_PRIME] = 0x692f8,
214 [HDCP_MESSAGE_ID_WRITE_SKE_SEND_EKS] = 0x69318,
215 [HDCP_MESSAGE_ID_READ_REPEATER_AUTH_SEND_RECEIVERID_LIST] = 0x69330,
216 [HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_SEND_ACK] = 0x693e0,
217 [HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_STREAM_MANAGE] = 0x693f0,
218 [HDCP_MESSAGE_ID_READ_REPEATER_AUTH_STREAM_READY] = 0x69473,
219 [HDCP_MESSAGE_ID_READ_RXSTATUS] = 0x69493,
220 [HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE] = 0x69494
221};
222
223static bool dpcd_access_helper(
224 struct dc_link *link,
225 uint32_t length,
226 uint8_t *data,
227 uint32_t dpcd_addr,
228 bool is_read)
229{
230 enum dc_status status;
231 uint32_t cur_length = 0;
232 uint32_t offset = 0;
233 uint32_t ksv_read_size = 0x6803b - 0x6802c;
234
235 /* Read KSV, need repeatedly handle */
236 if (dpcd_addr == 0x6802c) {
237 if (length % HDCP14_KSV_SIZE) {
238 DC_LOG_ERROR("%s: KsvFifo Size(%d) is not a multiple of HDCP14_KSV_SIZE(%d)\n",
239 __func__,
240 length,
241 HDCP14_KSV_SIZE);
242 }
243 if (length > HDCP14_MAX_KSV_FIFO_SIZE) {
244 DC_LOG_ERROR("%s: KsvFifo Size(%d) is greater than HDCP14_MAX_KSV_FIFO_SIZE(%d)\n",
245 __func__,
246 length,
247 HDCP14_MAX_KSV_FIFO_SIZE);
248 }
249
250 DC_LOG_ERROR("%s: Reading %d Ksv(s) from KsvFifo\n",
251 __func__,
252 length / HDCP14_KSV_SIZE);
253
254 while (length > 0) {
255 if (length > ksv_read_size) {
256 status = core_link_read_dpcd(
257 link,
258 dpcd_addr + offset,
259 data + offset,
260 ksv_read_size);
261
262 data += ksv_read_size;
263 length -= ksv_read_size;
264 } else {
265 status = core_link_read_dpcd(
266 link,
267 dpcd_addr + offset,
268 data + offset,
269 length);
270
271 data += length;
272 length = 0;
273 }
274
275 if (status != DC_OK)
276 return false;
277 }
278 } else {
279 while (length > 0) {
280 if (length > DEFAULT_AUX_MAX_DATA_SIZE)
281 cur_length = DEFAULT_AUX_MAX_DATA_SIZE;
282 else
283 cur_length = length;
284
285 if (is_read) {
286 status = core_link_read_dpcd(
287 link,
288 dpcd_addr + offset,
289 data + offset,
290 cur_length);
291 } else {
292 status = core_link_write_dpcd(
293 link,
294 dpcd_addr + offset,
295 data + offset,
296 cur_length);
297 }
298
299 if (status != DC_OK)
300 return false;
301
302 length -= cur_length;
303 offset += cur_length;
304 }
305 }
306 return true;
307}
308
309static bool dp_11_process_transaction(
310 struct dc_link *link,
311 struct hdcp_protection_message *message_info)
312{
313 return dpcd_access_helper(
314 link,
315 message_info->length,
316 message_info->data,
317 hdcp_dpcd_addrs[message_info->msg_id],
318 hdcp_cmd_is_read[message_info->msg_id]);
319}
320
321static const struct protection_properties dp_11_protection = {
322 .supported = true,
323 .process_transaction = dp_11_process_transaction
324};
325
326static const struct protection_properties *get_protection_properties_by_signal(
327 struct dc_link *link,
328 enum signal_type st,
329 enum hdcp_version version)
330{
331 switch (version) {
332 case HDCP_VERSION_14:
333 switch (st) {
334 case SIGNAL_TYPE_DVI_SINGLE_LINK:
335 case SIGNAL_TYPE_DVI_DUAL_LINK:
336 case SIGNAL_TYPE_HDMI_TYPE_A:
337 return &hdmi_14_protection;
338 case SIGNAL_TYPE_DISPLAY_PORT:
339 if (link &&
340 (link->dpcd_caps.dongle_type == DISPLAY_DONGLE_DP_VGA_CONVERTER ||
341 link->dpcd_caps.dongle_caps.dongle_type == DISPLAY_DONGLE_DP_VGA_CONVERTER)) {
342 return &non_supported_protection;
343 }
344 return &dp_11_protection;
345 case SIGNAL_TYPE_DISPLAY_PORT_MST:
346 case SIGNAL_TYPE_EDP:
347 return &dp_11_protection;
348 default:
349 return &non_supported_protection;
350 }
351 break;
352 case HDCP_VERSION_22:
353 switch (st) {
354 case SIGNAL_TYPE_DVI_SINGLE_LINK:
355 case SIGNAL_TYPE_DVI_DUAL_LINK:
356 case SIGNAL_TYPE_HDMI_TYPE_A:
357 return &hdmi_14_protection; //todo version2.2
358 case SIGNAL_TYPE_DISPLAY_PORT:
359 case SIGNAL_TYPE_DISPLAY_PORT_MST:
360 case SIGNAL_TYPE_EDP:
361 return &dp_11_protection; //todo version2.2
362 default:
363 return &non_supported_protection;
364 }
365 break;
366 default:
367 return &non_supported_protection;
368 }
369}
370
371enum hdcp_message_status dc_process_hdcp_msg(
372 enum signal_type signal,
373 struct dc_link *link,
374 struct hdcp_protection_message *message_info)
375{
376 enum hdcp_message_status status = HDCP_MESSAGE_FAILURE;
377 uint32_t i = 0;
378
379 const struct protection_properties *protection_props;
380
381 if (!message_info)
382 return HDCP_MESSAGE_UNSUPPORTED;
383
384 if (message_info->msg_id < HDCP_MESSAGE_ID_READ_BKSV ||
385 message_info->msg_id >= HDCP_MESSAGE_ID_MAX)
386 return HDCP_MESSAGE_UNSUPPORTED;
387
388 protection_props =
389 get_protection_properties_by_signal(
390 link,
391 signal,
392 message_info->version);
393
394 if (!protection_props->supported)
395 return HDCP_MESSAGE_UNSUPPORTED;
396
397 if (protection_props->process_transaction(
398 link,
399 message_info)) {
400 status = HDCP_MESSAGE_SUCCESS;
401 } else {
402 for (i = 0; i < message_info->max_retries; i++) {
403 if (protection_props->process_transaction(
404 link,
405 message_info)) {
406 status = HDCP_MESSAGE_SUCCESS;
407 break;
408 }
409 }
410 }
411
412 return status;
413}
414